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YOUR RESEARCHecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
dont have the original map
Reported cause
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1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed work
Replace immobiliser and keyfob
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0
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0
Unsuccessful attempts
1
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1
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Suggestion · Original poster
Excuse my ignorance, but is it just a simple process, a case of just swapping the ecu in the trunk,or will I also need to change the immobiliser and keyfob?
ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'dont have the original map' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'dont have the original map' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace immobiliser and keyfob' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Excuse my ignorance, but is it just a simple process, a case of just swapping the ecu in the trunk,or will I also need to change the immobiliser and keyfob?
ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace those three
Suggestion or failed attempt
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1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
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Suggestion · Original poster
Would I need to change those three for the car to work well?
ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace tuned map
Suggestion or failed attempt
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0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion
Go to a porsche dealer and ask for an ECU programming, that will replace the tuned map with the original one.
ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Set emissions
Suggestion or failed attempt
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0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Just keep the second (stock) set for emissions testing.
ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (5)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace immobiliser and keyfob
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Excuse my ignorance, but is it just a simple process, a case of just swapping the ecu in the trunk,or will I also need to change the immobiliser and keyfob?
ecu swap - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
A few months ago I remapped the ecu and now car wont pass emissions test. I did it at a garage when I was abroad with the car,so its not so easy to go back there! So I was wondering if I can buy a second hand ecu to put in just for the test. Excuse my ignorance, but is it just a simple process, a case of just swapping the ecu in the trunk,or will I also need to change the immobiliser and keyfob? I was hoping that as long as the part numbers of the ecu match,ill just have to swap the ecu. Any suggestions please?
No, it is not a simple swap. The system will need to be coded to work together, and depending upon the year of the vehicle, will require either a PST II or a PIWIS system. The DME will also have to be correct for the year, model, and how the car is equipped.
My car is a base 1999 model. I found an ecu from a 1999 box complete with immobiliser and key fob. So that would still not be enough,it will require some coding as well?
Yep, I think that's the easiest way out. I thought maybe I could just buy a second hand ecu and put it in just for the emissions test,and then swap it again,but I don't think its viable that way!
Problem is dont have the original map! Is there anything I could do to "cheat" the test? Its failing on co emissions they should be at around 0.5% and theyre reading about 2%. Is there anything I could temporary do to reduce co emissions for the test?
This solution will work fine! No additional coding is needed and no visit to the dealer.
You will also have to swap the key shank from your current key to the replacement key so it releases the steering lock (very easy to do in a couple of minutes).
Be careful not to lose the little transmitter "pills" inside the key fobs!
Having two sets of fob/immob/ECU will also let you easily swap back to the modified ECU/immob/fob after passing emissions testing (if desired).
Really? Wow thats what I want to hear. I found a second hand ecu together with immobiliser and key fob. Would I need to change those three for the car to work well? I will just need it temporarily till I do the test.
If you do not have the original, you can read the file BEFORE you go to the dealer, update it at the dealer,
go throught the co emissions control, read and save again the original and write the tuned one.
You will have both at your disposal, it is the cheapest way.
If you put another ECU, the number of hours will not match the cluster if you want to sell it.
Yes, the ECU/immob/fob are programmed as a matched set, so you will have to
swap all three for the car to run
. This should let you pass the emissions test and then you can swap back to the modified ECU/immob/fob set. Just keep the second (stock) set for emissions testing.
I know this works because this is exactly what I do.
